/Engine/Plugins/Experimental/Water/Source/Runtime/Public/WaterSubsystem.h
Static helper function to get a water subsystem from a world, returns nullptr if world or subsystem don't exist
static [UWaterSubsystem](API\Plugins\Water\UWaterSubsystem) * GetWaterSubsystem ( const [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld )